Holding chamber



FIG. 1 is a perspective view of a holding chamber;

FIG. 2 is a front view of the holding chamber shown in FIG. 1 ;

FIG. 3 is a rear view of the holding chamber shown in FIG. 1 ;

FIG. 4 is top view of the holding chamber shown in FIG. 1 ;

FIG. 5 is a right side view of the holding chamber shown in FIG. 1 ;

FIG. 6 is a left side view of the holding chamber shown in FIG. 1 ; and,

FIG. 7 is a bottom view of the holding chamber shown in FIG. 1 .

The broken lines in the drawings depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a holding chamber, as shown and described. 